Helical stent having improved flexibility and expandability
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United States of America Patent
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Jan 31, 2017
Grant Date -
Dec 19, 2013
app pub date -
Aug 19, 2013
filing date -
Aug 30, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A stent includes a central portion of helically wound undulations formed of struts, cylindrical end portions, and transition zones between the helical portion and the cylindrical portions. According to a first aspect of the invention, the torsional flexibility of the stent is maximized by having bridges connecting adjacent winding be interrupted by the maximum possible number of undulations. In one embodiment, each winding includes nineteen undulations around the circumference, bridges are provided every five undulations. According to a second aspect of the invention, uniform opening of the transition zone is achieved by altering the width, and thereby the flexibility, of a series of struts in accordance with their lengths. Specifically, the long transition zone struts are made wider.
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